WICHITA, Kan. (AP) — Crews are cleaning up at a Wichita elementary school where a lightning strike left windows shattered in several classrooms.

KFDI-FM reports (http://bit.ly/1nsnz1B ) no children were injured following the strike around 9 a.m. Thursday at Woodman Elementary School. But second-grade teacher Julie Nelson says children were frightened as glass flew.

The lightning bolt hit a tree just outside the building. Principal Jana Epperly says branches and other debris broke windows in at least eight classrooms.

Students had just arrived for the day but were not yet in their classrooms when the lightning hit. Several second- and third-grade classes were moved to other rooms.

A student’s grandfather was outside the school and was hit by flying bark. His injuries were described as minor.